Shoot regrowth potential and root development of Digitaria insularis subjected to mowing
DOI:
https://doi.org/10.18378/rvads.v19i1.10113Keywords:
Weed ecology, Weed management, Sourgrass, Organic managementAbstract
Digitaria insularis is a Poaceae disseminated mainly by seeds that can cause problems in agroecosystems. The objective of this work was to evaluate the influence of the age of D. insularis submitted to mowing on morphophysiological characteristics. Plants were grown in a greenhouse and cut close to the substrate at 21, 35, 49 and 77 days after emergence (DAE) or uncut, with evaluation of the variables up to 105 DAE. Except for chlorophyll b, the other variables were influenced by the age of the plants when cutting (p<0.05). Plant height and number of leaves decreased with increasing cutting age. The highest chlorophyll a content was observed in the cut at 51 DAE. Epicuticular wax mass was greater in the 49 DAE (0.4 mg cm-2) cut. The shoot dry mass decreased with increasing age at the cut, reaching zero (0 g) after 54 DAE. The root dry mass reached the minimum point when the aerial part was cut at 57 DAE. Shoot water content decreased with increasing cutting age. The root water content showed a biphasic behavior, with the lowest water content (18.8%) in the cut at 49 DAE. These results suggest that mowing close to 21 DAE favors the development of D. insularis. Therefore, D. insularis plants in optimal development conditions should be managed by mowing priority between 49 and 60 DAE.
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